They are both beautiful ships.
I'd go on the spirit, its a bit smaller- 20 ,000 tons smaller.. its got everything the dawn pretty much does, only in a smaller setting.
The crew is happy, and friendlier there i find. The dawn was a huge stressful place to work, and i think you'd notice it in the services you'd get onboard.

Its very clean, and its not so much walking to get to get to everywhere!

Anyway, i think you should try the spirit, because you've already been on the Dawn.. why not try something else.
The spirit- great choice.

The Dawn was built for NCL whereas the Spirit was reflagged from the parent company's line Star Cruises. I believe it was the SuperStar Leo. I've been on the Dawn but not the Spirit and it seems like a beautiful ship with enough differences to make it worthwhile trying.

We were also looking at the Spirit for a 6 night Bahamas cruise. However on Travelocity I read some not so great reviews. Does it depend greatly on the crew and the destination?
I know the ship is about 77,000 tons, and we want a fairly big ship to sail on with alot of activities. Will this fit the bill?